Automatically-closing furnace-door and device for opening the same.



No. 873,573. PATENTED DEC. 10, 1907. E. R. 8: J. 'MARKMANN. AUTOMATTOALLY CLOSING FURNACE DOOR AND DEVICE FOR OPENING THE SAME.

APPLICATION FILD MAY 2;, 1906.

unrrnn s. AES

ornrc EMIL R. MARKMANN AND JOHN MARKMANN, OF GHIGAGO', ILLINOIS.

Specification of Letters Patent.

Patented Dec. 10, 1907.

Application liled May 23.1996. Serial No. 318.395.

To all whom it may concem: 1

Be it known that we, EMIL R. MAnKM NN plate of a furnace in a manner to permit the doors to automatically close, and to provide means by which the doors may be 0 ened, both means being adapted to be applied to any construction of furnace.

With the above and other objects in view, the invention consists in the construction, combination and arrangement of parts hereinafter fully described, claimed and illustrated in the accompanying drawings, wherein:

Figure 1 is a sectional view of our invention. Fig. 2 is a sectional view on the line 22 of Fig. 1, the doors being opened.

Referring to the drawin s by reference numerals, 1 designates the front plate of a furnace provided with the usual openin 2, and 3 a platform. Guides 4 are secure to the front plate 1 and are p'tched downwardly to cause the doors 5, yirhioh are slidably mounted therein, to automatically close.

A lever 9 is ivotally secured in a bracket 10 supported eneath the platform 3, the operating end of the lever being rovided with a channeled cross head 11, w 'ch has its ends provided with perforations 12.

Each of a pair of links 13 has one of its ends secured to one of the doors '5 and its other end pivotally secured in the channeled head apted to" slidably'oonnect furnace doors to the front lever.

, open the doors.

the doors will move down the guides 4 and close the opening 2.

1 An engine 14 is ositioned directly beneath the power end of t e lever 9 and has mounted therein a piston head 15. A piston rod 16 is secured to the head 15 and to the power end of the lever 9 by means of a pin and slot connection17. A pi e 18 connects the engine 14 to a compressed air tank 19. A two-way valve 20 is interposed in the pipe 18 and when in one position establishes communication between the engine 14 and the tank-=19 and when in another osition cuts off com.- munication between t e engine and tank.

When the doors are closed, the head 15 is located within the upper end of the engine 14 and when it is desired to open the doors the valve 20is operated to establish communication between the engine 14 and the tank 19, to direct compressed air into'the engine above the head 15, whereupon the head 15 is moved downward. This downward movement of the head .15 elevates the operating end of the lever 9 and by virtue of the connection betweenthe lever 9 and the doors 5, opens the doors. When it is desired to permit the doors to close, the valve 20 is operated to cut off communication between the boiler and engine and a three-way valve 2O operated to establish communication between the engine and the atmosphere, whereupon the Weight of the doors will automatically close the same and cause the head'15 to move upward, said valve 20*- being interposed in pipe 18 between the valve 20 and the engine. To assist the automatic closing of the doors, a spring 21 is interposed between the power end of the lever!) and the bracket 10. A bracket, 22 is secured to the platform 3 and straddles the lever 9, the spring 21 being inter osed between this bracket and the y locating the spring 21 between the arms of the bracket 22 the same is prevented from lateral conto'rtion when compressed during the operation of the lever to To-prevent the doors from closing too suddenly and bruising their opposing vertical ed es, weprovide a dash pot 23, the plunger 0 which has a pin and slot ponnection 24 with the operating end of the ever'9.-

Q ,14. When theforce applied to the arm 24 to move itj dOWI1W&Id is removed, a spring interposed betweensaid arm and the plat .form 3 moves said arm upward, this upward 30 A bell crank treadle lever 23 is pivotally l lever, and means adapted to control the op- 65 mounted upon the underside of the platform I 3, its long arm 24 projecting through a slot 25in the platform and the end of its short arm 26 engaging the lever 9 at a point near its power-end.-v The stem of the valve 20 is connected to the long arm of the lever 23 by a rod 27, while the stem of the valve'20 is 7 connected to the rod 27 by a rod 28 and bell crank lever 29, said lever 29 having a pin and slot connection with the rod 27.

When it is desired to'open the doors 5, the arm 24? of the lever 23 ISfOIGGd downward,

whereby, in view of the connection between said arm and the valves'20 and 20, the valve .20- is operated to establish communication between the engine 14 and the an tank 19,

while the valve 20 is operated to cut off comatmosphere.

a ward movement of said arm will impart an initial movement to the lever 9, the full movement thereof being completed by the entrance of compressed air into the engine jmovement. closing the valve 20 and opening the valve 20, thus permittingthe escape of the exhaust and permitting the doors 5 to close.

From the foregloing'description, taken in connection with t e accompanying drawings,

" v the construction and mode of operation of the invention will be understood Without a further extended description.

Chan es in the form, proportions and nor details of construction may be made within the scope of 'the' linvention without departing from" the spirit or sacrificing any of the advantages thereof. v I Having thus described our invention, what we claim is: p

1. In combination with a furnace, of automatically closing doors, a pivotally mounted lever, a connection between -the operating end'of said lever and the doors, an engine having connection with the power end of said lever, a pipe connecting the engine to an air tank, a valve i'nte osed in said pipe between the engine an tank, another valve interposed between the engine and first named valve, and anotherlever connected to the valvesand adapted to'be operated to close one and open the other of said valves and to im art an initial'movement to the first name lever.

2. The combination with an automaticallycreme erating means and by which an initial movement can be imparted to the lever.

3. The combination with an automatically closing furnace door, of a pivotally mounted lever, a connection between the operating end of the lever and the door, an operating means connected to the power end of the lever, and another lever connected to the operating means and by means can be controlled, said other lever providing means by-which an initial movement can be imparted to the first named lever.

4; The combination with an automatically closing furnace door, of a pivotally mounted lever, a connection between the operating a end of the lever and the door, a dash pot con-' which said operating nected to the operating, end ofifthe lever, op-

erating means connectedto the power endofthe lever, and means adapted to control the operating means and by which an initial movement can'be imparted to the lever.

5. The combination with an automatically, closing furnace door, of a pivotally mounted .1

lever, a connection between the operating end of the lever and the door, op t means connected to the po d of they lever, means adapted to control the op n I means and by which an initial movement can be imparted to the lever, and a spring acting upgn the lever at a point adjacent its power on 6. The combination with an automatically closing furnace door,of a pivotally mounted lever, a connection between the operating end of the lever and-- the door, a dash potconnected'to the operating end of the lever, operating means connected to the power endof the'lever, means adapted 'to control'the op erating means and by which an initial move+ ment can be imparted to the lever,--and a spring acting upon the lever ata point adj'a-.

cent its power end.

7. In combination with a furnace-of downwardly inclined guides secured to the front plate of the furnace about the. opening therein, .doors mounted in the guides toautomatically close, a pivotally mounted lever, a connection between the lever and the door, operating means connected to thepower end of the lever, and means adapted to control the operating means and by which an initial movement can be imparted to the lever.

' 8. In combination with a furnace, of downwardly inclined guides securedto the front plate of the furnace about the opening therein, doors mounted in the guides to automatically close, apivotally mounted "lever, connection between the operating end verating means connected to the power end of the lever, a treadle lever connected' to the In testimony'whereof weafiix our signaoperatjng means, said treadle lever providlng ture in presence of two witnesses.-

means by which the operating means can be EMIL R. MARKMANN. controlled and by which an l 'nltial movement JOHN MARKMANN. can be imparted to the first named lever, and Witnesses:

a. spring acting upon the first named lever at JOHN P. GAHAN,

a point adjacent its power. end. TnoMAs F. GAnAN. 

